type b1 = { name: string; age: number; skill: string };

type b3 = string | number | boolean;
// Extract 用于过滤需要的属性
type b2 = Extract<b3, string>;
type b4 = Extract<b1, { name: string }>;
const hd: b4 = {
  name: "",
  age: 0,
  skill: "",
};

export default {};
